Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Multi-purpose SOT 23 5

V+

–IN+IN

V–

OUT

DBV PACKAGE

(TOP VIEW)

OUT

2.2pF

Ω

SD1

BAT17

10nF

7.5

Ω

−

OPA365

OPA365-EP

www.ti.com

SLOS735 –AUGUST 2011

50-MHz Low-Distortion High-CMRR Rail-to-Rail I/O, Single-Supply Operational Amplifier

Check for Samples: OPA365-EP

FEATURES

SUPPORTS DEFENSE, AEROSPACE,

AND MEDICAL APPLICATIONS

• Gain Bandwidth: 50 MHz

• Controlled Baseline

• Zero-Crossover Distortion Topology

• One Assembly/Test Site

– Excellent THD+N: 0.0004%

• One Fabrication Site

– CMRR: 96.5 dB (Min)

• Available in Military (–55°C/125°C),

– Rail-to-Rail Input and Output

Temperature Range

(1)

– Input 100 mV Beyond Supply Rail

• Extended Product Life Cycle

• Low Noise: 4.5 nV/√Hz at 100 kHz

• Extended Product-Change Notification

• Slew Rate: 25 V/µs

• Product Traceability

• Fast Settling: 0.3 µs to 0.01%

• Precision

– Low Offset: 100 µV

(Typical at 25°C)

– Low Input Bias Current: 0.2 pA

(Typical at 25°C)

• 2.2-V to 5.5-V Operation

(1) Additional temperature ranges available - contact factory

DESCRIPTION

The OPA365 zero-crossover series, rail-to-rail, high-performance, CMOS operational amplifier is optimized for

very low voltage, single-supply applications. Rail-to-rail input/output, low-noise (4.5 nV/√Hz) and high-speed

operation (50-MHz gain bandwidth) make this device ideal for driving sampling analog-to-digital converters

(ADCs). The OPA365 supports audio, signal conditioning, sensor amplification, defense, aerospace and medical

applications. The OPA365 is also well-suited for cell phone power amplifier control loops.

Special features include an excellent common-mode rejection ratio (CMRR), no input stage crossover distortion,

high input impedance, and rail-to-rail input and output swing. The input common-mode range includes both the

negative and positive supplies. The output voltage swing is within 10mV of the rails.

The OPA365 is available in the SOT23-5 package and is specified for operation from −55°C to 125°C.

Figure 1. Fast Settling Peak Detector

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (19 pages)

PAGE 1
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com 50-MHz Low-Distortion High-CMRR Rail-to-Rail I/O, Single-Supply Operational Amplifier Check for Samples: OPA365-EP SUPPORTS DEFENSE, AEROSPACE, AND MEDICAL APPLICATIONS FEATURES 1 • • • • • • • Gain Bandwidth: 50 MHz Zero-Crossover Distortion Topology – Excellent THD+N: 0.0004% – CMRR: 96.5 dB (Min) – Rail-to-Rail Input and Output – Input 100 mV Beyond Supply Rail Low Noise: 4.5 nV/√Hz at 100 kHz Slew Rate: 25 V/µs Fast Settling: 0.3 µs to 0.
PAGE 2
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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OPA365-EP SLOS735 – AUGUST 2011 www.ti.com ELECTRICAL CHARACTERISTICS VS = 2.2 V to 5.5 V, RL = 10 kΩ connected to VS/2, VCM = VS/2, and VOUT = VS/2 (unless otherwise noted) PARAMETER TA (1) TEST CONDITIONS MIN TYP MAX 100 200 UNIT OFFSET VOLTAGE VOS Input offset voltage dVOS/ dT Input offset voltage drift PSRR Input offset voltage vs power supply 25°C Full range VS = +2.2V to +5.5V µV 450 µV/°C Full range 3 Full range 10 100 µV/V ±0.
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OPA365-EP SLOS735 – AUGUST 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VS = 2.2 V to 5.
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OPA365-EP SLOS735 – AUGUST 2011 www.ti.
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OPA365-EP SLOS735 – AUGUST 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 5 V, CL = 0 pF (unless otherwise noted) S SHORT−CIRCUIT CURRENT vs TEMPERATURE OPA365 OUTPUT VOLTAGE vs OUTPUT CURRENT 3 Output Voltage (V) 2 1 0 +125°C Short−Circuit Current (mA) VS = ±1.1V VS = ±2.75V −55°C −40°C +25°C +25°C −40°C −55°C +125°C –1 –2 –3 0 10 20 30 40 50 60 70 80 90 70 60 50 40 30 20 10 0 −10 −20 −30 −40 −50 −60 −70 −80 VS = ±2.
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OPA365-EP SLOS735 – AUGUST 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 5 V, CL = 0 pF (unless otherwise noted) INPUT VOLTAGE NOISE SPECTRAL DENSITY OVERSHOOT vs CAPACITIVE LOAD 60 50 100 Overshoot (%) Voltage Noise (nV/√Hz) 1k 10 G = +1 40 G = −1 30 G = +10 20 10 G = −10 1 0 10 100 1k 10k 100k 0 100 Frequency (Hz) Output Voltage (1V/div) LARGE−SIGNAL STEP RESPONSE G=1 RL = 10kΩ VS = ±2.
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OPA365-EP SLOS735 – AUGUST 2011 www.ti.com APPLICATION INFORMATION Operating Characteristics The OPA365 amplifier parameters are fully specified from 2.2 V to 5.5 V. Many of the specifications apply from −55°C to 125°C. Parameters that can exhibit significant variance with regard to operating voltage or temperature are presented in Typical Characteristics. General Layout Guidelines The OPA365 is a wideband amplifier.
PAGE 9
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com Figure 3 shows a single-supply, electret microphone application where VCM is provided by a resistive divider. The divider also provides the bias voltage for the electret element. 49kΩ Clean 3.3V Supply 3.3V 4kΩ VOUT OPA365 Electret Microphone 6kΩ 5kΩ 1µF Figure 3. Microphone Preamplifier Input and ESD Protection The OPA365 incorporates internal electrostatic discharge (ESD) protection circuits on all pins.
PAGE 10
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com Rail-to-Rail Input The OPA365 features true rail-to-rail input operation, with supply voltages as low as ±1.1 V (2.2 V). A unique zero-crossover input topology eliminates the input offset transition region typical of many rail-to-rail, complementary stage operational amplifiers. This topology also allows the OPA365 to provide superior common-mode performance over the entire input range, which extends 100 mV beyond both power-supply rails, as shown in Figure 5.
PAGE 11
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com Capacitive Loads The OPA365 may be used in applications where driving a capacitive load is required. As with all op amps, there may be specific instances where the OPA365 can become unstable, leading to oscillation. The particular op amp circuit configuration, layout, gain and output loading are some of the factors to consider when establishing whether an amplifier will be stable in operation.
PAGE 12
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com Achieving an Output Level of Zero Volts (0V) Certain single-supply applications require the op amp output to swing from 0 V to a positive full-scale voltage and have high accuracy. An example is an op amp employed to drive a single-supply ADC having an input range from 0 V to 5 V. Rail-to-rail output amplifiers with very light output loading may achieve an output level within millivolts of 0 V (or +VS at the high end), but not 0 V.
PAGE 13
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com Active Filtering The OPA365 is well-suited for active filter applications requiring a wide bandwidth, fast slew rate, low-noise, single-supply operational amplifier. Figure 9 shows a 500-kHz, 2nd-order, low-pass filter utilizing the multiple-feedback (MFB) topology. The components have been selected to provide a maximally-flat Butterworth response. Beyond the cutoff frequency, roll-off is −40 dB/dec.
PAGE 14
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com +5V C1 100nF +5V R1(1) 100Ω V+ +IN OPA365 C3(1) 1nF V− VIN 0 to 4.096V −IN ADS8326 16Bit 250kSPS REF N I +5V Optional(2) R2 500Ω SD1 BAS40 −5V C2 100nF REF3240 4.096V C4 100nF Figure 11. Driving the ADS8326 One method for driving an ADC that negates the need for an output swing down to 0 V uses a slightly compressed ADC full-scale input range (FSR).
PAGE 15
OPA365-EP SLOS735 – AUGUST 2011 www.ti.com An RC network, consisting of R1 and C1, is included between the op amp and the ADS8361. It not only provides a high-frequency filter function, but more importantly serves as a charge reservoir used for charging the converter internal hold capacitance. This capability assures that the op amp output linearity is maintained as the ADC input characteristics change throughout the conversion cycle.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.